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I need to find what takes the question marks place. help please i have limited time. i’ll give good review. (10x^2+10x^3-9x^4)-(4x^3+?-8x^2)=-19x^4+6x^3+18x^2
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I need to find what takes the question marks place. help please i have limited time. i’ll give good review.

(10x^2+10x^3-9x^4)-(4x^3+?-8x^2)=-19x^4+6x^3+18x^2

User MayeulC
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The answer is 10x^4 I think
User FJDU
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